International Journal of Minerals Metallurgy and Materials
·
2022
·Vol. 29
·期 2
·248-255
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IF 3.85
Ren Guoxing,Xiao Songwen,Liao Caibin,Liu Zhihong
As a part of the fundamental study related to the reduction smelting of spent lithium-ion batteries and ocean polymetallic nodules based on MnO-SiO 2 slags, this work investigated the activity coefficient of NiO in SiO 2 -saturated MnO-SiO 2 slag and Al 2 O 3 -saturated MnO-SiO 2 -Al 2 O 3 slag at 1623 K with controlled oxygen partial pressure levels of 10 −7 , 10 −6 , and 10 −5 Pa. Results showed that the solubility of nickel oxide in the slags increased with increasing oxygen partial pressure. The nickel in the MnO-SiO 2 slag and MnO-SiO 2 -Al 2 O 3 slag existed as NiO under experimental conditions. The addition of Al 2 O 3 in the MnO-SiO 2 slag decreased the dissolution of nickel in the slag and increased the activity coefficient of NiO. Furthermore, the activity coefficient of NiO ( γ NiO ), which is solid NiO, in the SiO 2 saturated MnO-SiO 2 slag and Al 2 O 3 saturated MnO-SiO 2 -Al 2 O 3 slag at 1623 K can be respectively calculated as γ NiO = 8.58 w (NiO) + 3.18 and γ NiO = 11.06 w (NiO) + 4.07, respectively, where w (NiO) is the NiO mass fraction in the slag.
研究领域:
冶金学
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材料科学
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产品关联
DOI
高影响因子
Small
·
2025
·
IF 12.1
Lianxiao Zhang,Qijie Diao,Bo Li,Xuedan Yang,Teng Wang,Rui Chen,Tianze Jiang,Xia Zhao
Breast cancer is a common malignant tumor in women worldwide, and its high metastasis is the main reason for high mortality. Especially under hypoxic microenvironments, the upregulation of hypoxia-inducible factor 1-alpha (HIF-1α) can activate the transcription factor Twist and promote tumor metastasis through epithelial-mesenchymal transformation (EMT). Here, MnO 2 nanosheets are synthesized with oxidase-like activity using fucoidan as a protective agent, and construct a multifunctional delivery system MnO 2 @DNAzyme-TPZ (MDT) by loading DNAzymes and hypoxia-activated prodrug Tirapazamine (TPZ) for tumor treatment and metastasis inhibition. MDT kills tumors by converting O 2 into reactive oxygen species (ROS) through MnO 2 nanozymes, and inhibits tumor metastasis by selectively silencing the tumor metastasis-related Twist gene through DNAzymes. TPZ enhances tumor killing under hypoxic environments and synergistically inhibits tumor metastasis by reducing the expression of HIF-1α. MDT significantly inhibits tumor growth and metastasis in vivo in an in situ tumor model. The strategy of combining selective gene silencing based on DNAzymes with nanozymes and hypoxia-activated prodrug provides a new approach to anti-tumor metastasis therapy.
研究领域:
肿瘤学
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生物医学工程
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药物递送系统
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产品关联
DOI
PubMed
高影响因子
Energy Technology
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2025
·
IF 3.6
Anping Tang,Zhixing Sui,Liping Ning
Lithium fluoride-transition metal oxide (LiF–TMO) composites have become an attractive alternative to the traditional intercalation-type cathodes due to their high specific capacity. However, current preparation methods of these composites are not suitable for large-scale production. Therefore, it is necessary to seek new methods for preparing these composites. In the present study, LiF–MnO composites are successfully prepared by a novel solid-state reaction method using polytetrafluoroethylene as a fluorinating agent. The X-ray diffraction patterns of the samples show that LiF–MnO composites without other fluoride impurities can be achieved by optimizing sintering temperature, sintering time, and the Poly(tetrafluoroethylene) contents in the precursor. In the voltage range of 1.5–4.8 V at C/20 rate, the composite delivers a first discharge specific capacity of 180 mAh g −1 and exhibits a fairly stable cycle life.
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DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Guanfeng Tian,Youqing Wu,Shiyong Wu,Sheng Huang,Jinsheng Gao
Synthesizing methanol from CO 2 and green hydrogen is a promising strategy to solve environmental issues and meet the increasing energy demand. In this work, Pd/MnO/In 2 O 3 catalyst with highly dispersed Pd species was prepared via an in-situ reduction method using NaBH 4 as the reducing agent. The highly dispersed Pd species promoted the dissociative of hydrogen and the hydride species could spill over to the MnO/In 2 O 3 due to the strong metal-support interaction between Pd and MnO/In 2 O 3 , which improved the catalytic activity of Pd/MnO/In 2 O 3 for CO 2 hydrogenation to methanol. As a result, the methanol space-time yield of 1 wt% Pd/MnO/In 2 O 3 was 4.8 times higher than that of MnO/In 2 O 3 . Moreover, the methanol selectivity of 1 wt% Pd/MnO/In 2 O 3 was still higher than 70% at a temperature below 280 °C. The present in-situ reduction method is an effective route for the preparation of Pd/MnO/In 2 O 3 catalyst for CO2 hydrogenation to methanol.
研究领域:
催化化学
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环境科学
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能源化学
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DOI
高影响因子
ACS Nano
·
2025
·
IF 16
Ao Chen,Guanhua Xu,Yuting Tang,Xiuyu Wang
While recent advancements in spin manipulation have utilized topological insulators and non-collinear antiferromagnets confined to two-dimensional films, dimensional limitations have hindered the realization of truly freestanding spin-dependent quantum nanodevices (nm3). Here, we exploit a robust vertical exchange bias confined within core–shell FePt@MnO nanoparticles (D ∼ 9 nm) to control the spin decoherence time of Fe and Mn magnetic atoms. The magnitude (approximately 17% of interfacial spins are fully pinned) and robustness (the pinned spins remain stable even under a negative field of −5 T) of this anomalous exchange bias arise from a coherent interface where strain-induced lattice distortion displaces Mn cations by ångström-scale distances from their equilibrium positions, aligning them with Fe cations. This interfacial coherence enhances interfacial spin–spin exchange coupling─manifested as the anomalous exchange-bias effect─which directly modulates spin decoherence dynamics: τ2 for Mn2+ spins shortens by 9.8% (108.3 ps → 98.5 ps), while Fe spins exhibit a concomitant τ2 enhancement. This work establishes a direct link between spin decoherence time and the exchange-bias effect, offering a pathway for the coherent engineering of quantum nanomaterials.
研究领域:
纳米材料
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量子器件
·
自旋电子学
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DOI
PubMed
高影响因子
Small
·
2021
·Vol. 18
·期 6
·2106273
·
IF 13.281
Huan Liu,Na Li,Weibin Zhang,Shiwei Zhang,Jianchuan Wang,Yong Du
Heterogeneous atoms substitution is an efficient method for promoting Li + storage of transition metal oxides. Herein, a series of Fe-substituted MnO solid solutions with different Fe contents are synthesized by a feasible solid-phase method. The synergistic effects between heterogeneous atoms and rich vacancies are synchronously obtained, which hold distinctive electronic structures and substantial active sites. When optimized Mn 0.55 Fe 0.45 O solid solution as anodes for lithium-ion batteries, pre-prepared electrodes exhibit reversible lithium storage of 1286.9 mAh g –1 at 1 A g −1 after 400 cycles and even 628.1 mAh g –1 at 2 A g –1 after 1000 cycles. The LiCoO 2 //Mn 0.55 Fe 0.45 O full cells are assembled, achieving the reversible capacity of 130.2 and 111.3 mAh g –1 after 150 cycles at 0.1 and 0.2 A g –1 , respectively. Density functional theory calculations also authenticate that the electrochemical activity can be markedly boosted by the heterogeneous atoms substituted Mn 1 -x Fe x O solid solution.
研究领域:
材料科学
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电化学
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电池技术
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DOI
高影响因子
POLYHEDRON
·
2025
·
IF 2.6
Yuan-Zhen Wang,Liu Yang,Jia-Jia Kou,Yu-Qing Zhan,Yi-Lin Niu,Yu-Long Liu
Flumioxazin, a nitrophenyl herbicide widely used in agriculture, poses potential health risks due to its residue in agricultural products. This study elucidates the fabrication of a novel electrochemical sensor, MnO@C , specifically designed for the efficient detection of flumioxazin. The sensor MnO@C was created by annealing Mn-BTC , synthesized via a straightforward solvothermal method. The electrochemical behavior of MnO@C for detecting flumioxazin was assessed through DPV. The findings revealed that MnO@C demonstrated a wide detection range, achieving an exceptionally low LOD at 597 fmol/L for flumioxazin. Moreover, MnO@C exhibited exceptional duplicability, reliability, and anti-interference ability. The sensor MnO@C was also effectively utilized for the quantitative detection of flumioxazin in diverse samples. The results highlight the substantially practical utility of MnO@C in food and environment detection, which provides broad-spectrum environmental resistance and fast, efficient detection for flumioxazin residue. Additionally, a thorough analysis of the mechanism of MnO@C for monitoring flumioxazin was undertaken.
研究领域:
环境科学
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食品科学
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材料科学
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DOI
高影响因子
ANALYTICA CHIMICA ACTA
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2023
·
IF 6.2
Shiqi Xu,Songtao Wang,Ling Guo,Yuqin Tong,Lina Wu,Xingxu Huang
CRISPR-based detection was often based on the target preamplification to realize the high sensitivity. Here, we prepared a CRISPR-Cas12a system for the colorimetric detection of lead ion (Pb 2+ ) based on the assistance of DNAzyme and nanozyme instead of preamplification. The recognition between GR-5 DNAzyme and Pb 2+ could trigger the CRISPR-Cas12a system. MnO 2 nanozymes connected with magnetic beads through single stranded DNA were prepared as the colorimetric signal probes and catalyst of CRISPR-Cas12a system for the strong oxidase-like activity inducing the color change of 3,3′,5,5′-tetramethylbenzidine. The nanozyme-catalysed CRISPR-Cas12a system could be used to detect Pb 2+ through the color change with high specificity and sensitivity. The linear range of this approach was 0.8 nM–2500 nM, with a limit of detection of 0.54 nM. This method was applied for the detection of the Pb 2+ in food samples indicating good accuracy and anti-interference ability.
研究领域:
生物传感器
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分析化学
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环境科学
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食品安全
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2023
·
IF 6.2
Sihai Lv,Yongzhi Cheng,Fu Chen,Xiangcheng Li,Hui Luo
Exploring high-performance electromagnetic wave (EMW) absorbers remains a formidable challenge in the face of severe EMW radiation and interference. The incorporation of manganese oxide into carbon matrix magnetic composites is proposed to enhance the EMW absorption properties in this work. Multiple interfacial ternary-component Fe 3 C/MnO/Nitrogen-doped carbon (NC) absorbers were synthesized through facile hydrothermal, oxidative polymerization and carbothermal reduction processes. The results indicated that the composites designed exhibit excellent EMW absorption properties, with an effective absorption bandwidth of 4.88 GHz (13.12–18 GHz) at a mere thickness of 1.5 mm. The outstanding performance of EMW absorption can be attributed to the effective modulation of electromagnetic parameters through a large number of heterogeneous interfaces, defects, and magnetic loss. Meanwhile, adjusting the filling ratios of the composites in the absorber also can significantly adjust the electromagnetic parameters of the samples. This work presents effective approach for the preparation of high-performance EMW absorbers with ternary components, as well as a strategy for developing novel broadband absorbers that are lightweight and have thin thickness.
研究领域:
材料科学
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电磁学
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DOI
高影响因子
CRYSTENGCOMM
·
2020
·Vol. 22
·期 28
·4790-4796
·
IF 3.117
Kaixuan Zhao,Zhijie Yang,Huiying Wei,Jinxin Guo,Yanzhao Yang,Jingjing Wei
The prevalent synthesis of colloidal metal oxide nanocrystals relies on the synthesis of various precursors, such as organometallic compounds, which are usually sensitive to moisture or oxygen and generally expensive. Based on the economic efficiency, the costs of the starting materials and synthetic process should be addressed. Herein, a general simple synthetic procedure from inexpensive and nontoxic precursors is developed. Under optimized reaction conditions, MnO nanocrystals are synthesized with commercially purchased bulk manganese oxides as starting materials, such as MnO, MnO2, and Mn3O4. The size and morphologies of nanoparticles are modulated by tuning the types and dosage of coating agents. Moreover, this synthetic strategy is further extended to other nanoparticles including Fe3O4 nanocrystals and FeMnOx nanocrystals. Furthermore, Re doped MnO nanocrystals exhibiting fluorescence properties have been synthesized with this method, which endows the fluorescence properties to these oxide nanocrystals.
研究领域:
材料科学
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纳米技术
·
化学
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DOI
高影响因子
CRYSTENGCOMM
·
2020
·Vol. 23
·期 2
·482-491
·
IF 3.117
Lin-Hui Wu,Shu-Li Yao,Jing Li,Hui Xu,Teng-Fei Zheng,Sui-Jun Liu,Jing-Lin Chen,He-Rui Wen
A novel luminescent CdII-based metal–organic framework {[Cd(BBIP)(TBIP)]·EtOH}n (1) derived from the multidentate 5-tert-butylisophthalic acid (H2TBIP) and the semi-rigid N-donor 3,5-bis(benzimidazol-1-yl)pyridine (BBIP) has been solvothermally synthesized and structurally characterized by using infrared spectroscopy, thermal analysis, single-crystal X-ray diffraction and powder X-ray diffraction. The adjacent CdII ions are linked by two carboxylate groups of one TBIP2− ligand with chelating mode to form a one-dimensional CdII-TBIP2− chain, which is further connected by the BBIP ligand to obtain a two-dimensional network. Interestingly, the fluorescence experiments indicate that 1 could be considered as a good multi-responsive sensing material for detecting Fe3+, MnO4−, Cr2O72−, salicylaldehyde (SA) and ethylenediamine (EDA) via the turn-off effect, with the detection limits of 0.53, 0.98, 3.6, 0.42 and 5.3 ppm, respectively. The luminescence quenching effect induced by Fe3+ could be mainly ascribed to the competitive absorption mechanism. The electron-transfer transition and competitive absorption mechanism could be used to explain the luminescence quenching of MnO4− and Cr2O72−. The turn-off effect of 1 on SA could be ascribed to the photoinduced electron-transfer and competitive absorption mechanisms. Meanwhile, the possible mechanism of fluorescence quenching caused by EDA could be attributed to the structure collapse. More importantly, 1 could be regenerated and reused after five cycles for Fe3+, MnO4−, Cr2O72− and SA detection. In a nutshell, 1 could be employed as a multi-responsive luminescent sensor used for the highly selective and sensitive detection of metal ions, anions and small organic molecules.
研究领域:
材料科学
·
分析化学
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DOI
高影响因子
NANOTECHNOLOGY
·
2019
·Vol. 30
·期 33
·335401
·
IF 3.399
Peiyuan Ji,Jing Wan,Yi Xi,Yuzhu Guan,Chengshuang Zhang,Xiao Gu,Jien Li,Junlin Lu,Dazhi Zhang
One-dimensional tunnel and layer frame crystal structure materials are extremely attractive for energy storage in electrode materials. The energy storage properties of the electrode materials depend on their conductivity. Furthermore, the conductivity of electrode materials can be tailored through combination or doping with other materials, which transforms their properties from semiconductor to semimetallic or metallic and allow them to show unequaled performance for storage devices. In this work, heterostructures of manganese oxide (MnO) and modified sodium titanate (Na2Ti6O13) (MnO@Na2Ti6O13) nanowires are attained by the in situ thermal decomposition method. The heterojunction between MnO and Na2Ti6O13 allows the semiconductor properties of pure Na2Ti6O13 to show remarkable metallic behavior for improving the electrochemical performance. The capacitance of MnO@Na2Ti6O13 heterojunction nanowires can reach 272.3 F g−1, a power intensity of 250 W kg−1 at the energy density of 37.83 Wh kg−1 and retain 5000 W kg−1 at 6.67 Wh kg−1 as well. The energy storage mechanism of the MnO@Na2Ti6O13 heterostructure is studied by density functional theory. All of the results show that the MnO@Na2Ti6O13 heterostructure material has the potential to be an excellent supercapacitor material in the future.
研究领域:
材料科学
·
能源存储
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DOI
高影响因子
危险品化学品经营许可证（带存储）